The HVAC 5000 rule says to multiply the system’s age by the repair cost; if the result is over $5,000, replacement usually makes more sense than repair. It’s a quick way to balance the remaining life of the unit against the cost of a one-time fix.
Our technicians use this guideline in the Jacksonville area but still confirm with a full system evaluation. We also look at warranty status, refrigerant type, and energy use, because a small failed part on an older unit can signal wider wear.
Use these practical checks alongside the 5000 rule:
- Multiple breakdowns in the last year
- Longer run times with uneven temperatures
- Major parts out of warranty or hard to source
Ask a licensed pro to price both options and show the math before you decide.
Updated: 2026-08-06
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